Moving or Not Moving?

For me they seem to be gently waving.





Supposedly;

The pictures are used to test the level of stress a person can handle. The slower the pictures move, the better your ability of handling stress. Alleged criminals that were tested see them spinning around madly; however, senior citizens and kids often see them standing still.

I don't know if I buy that or not, but it is interesting how they move.

They are of course actually perfectly still.